@liquidfractal I just did a quick patch fixing the issues you mentioned
as for this
The problem is in your side only. you have installed and enabled this plugin below
But, if you don't use it, then disable it. this plugin overrides any background images added to body tag but again you dont use it, you just enabled the plugin and you want to use the background image in the theme! if you have enabled this plugin or trying to use it then forget about the theme background image and start using the plugin. or disable it and use the theme background image.
That was the "More" drop down menu i break with the latest update. its not like im always breaking something man that was "one" thing xD shT happens sometimes, im not perfect BUT, i fixed it one hour after you reported if that's not fast enough for you then I'm not sure what else i can do about it because like it or not, this kind of situations will happen
the other color issues was never something i broke with the update it was simply not fixed.